There are some nouns that are always in singular form. They are uncountable and do not have a plural form.
We do not use the articles – a/an before them but if they are particular we can use the article – the.
They are used with singular verbs.
Examples:
| advice | baggage | homework |
| information | luggage | furniture |
| knowledge | dust | traffic |
My homework was very easy.
The luggage is heavy.
Their information was helpful.
Special case:
Some of these nouns end in -s and -ics they may be mistaken for plural nouns. They are in the singular and they are used with singular verbs.
Examples:
| mathematics | aerobics | measles |
| physics | politics | mumps |
| economics | news | progress |
Physics is my favorite subject..
His progress was slow.
Measles is a serious disease.